Extrusion & Post
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ASA shutdown cleaning contamination
Problem Phenomenon
After ASA shutdown, other materials are used for cleaning and replacement as usual; after resuming production, black specks, delamination and performance abnormalities appear, and cleaning material residue is difficult to purge completely.
Cause Analysis
Plastribution explicitly points out that ASA shutdown cleaning should not use other materials for replacement, as foreign material mixing creates contamination risk; ASA has poor compatibility with most resins, and residual cleaning material forms sandwich delamination.
Solution
①For shutdown cleaning, only turn off heating and empty and clean the machine with ASA's own material; ②avoid foreign cleaning materials; ③for long-term shutdown, dismantling and cleaning the screw is more reliable; ④strengthen appearance and performance inspection of the first batch after resuming production.
Key Takeaway
ASA purging specifications are different: refuse foreign cleaning materials; emptying with its own material plus turning off heating is the standard action; contamination risk far outweighs the saved cleaning time.
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